Well-screen.



H. RODRIGO, SR-

WELL SCREEN.

APPLICATION FILED NOV.2, 191s.

Patented Feb. 19; 1918.

v lNl/EIVjTOR IAI /llll/Jl BY H W A 'TTOR/l/Eyi ing fluid.

' of Texas, have invented certain new r nonme sa, or nous'roii, 'rnxas.

warm-SCREEN.

a citizen of the United States, residin at Houston, in the county of. Harris and. tate and useful Im rovements 'in Well-Screens, of which the following is'a specification.

This invention relates to new and useful improvements in a well screen.

The object ofhe inventlon is to provide a screen of the character described particularly adapted to be used in oil or water wells for screenin outthe sand fromthe inflowtomary to set a screen composed of pne or more oints ofperforated pi e therein and the fluid from the surrounding reservoir flows in through the perforations and passes up through the pipe to the surface. The

pipe is usually wrapped with spirally wound wire having the turns s aced a small distanceapart so as to exclu e, the sand. Sometimes thimbles with narrow slits are secured in the perforations which" act as screens to exclude such sand and other similar detritus. But when agreat deal of sand is encountcred, the screening surface, however composed, is liable to become clogged by the sand and the inflow of fluid entirely shut 80' 0E. It is the-object of this invention to provide a screen of two concentrically arranged pipes spaced apart and fixed relative to one another, both pipes being perforated and the inner pipe being wrapped with screening wire or provided with screening thimbles or some other similar screening means and the space between the pipes filled with coarse aggregate which intercepts and arrests the sand and detritus and revents it from reaching this screening su ace of the inner pipe and clogging the same.

A further feature of the invention resides in the provision of a screen of the character described which will be simple and inexpensive in its construction and efl ective in admittinglthe flow of fluid and excluding the sand and detritus held in suspension therein.

With the above and other objects in view,

j Specification of iiejtters l'atent.

. Appllcationfiled November 2, i916. Serial No. 129,138.

en a well is bored it is cus-' Fig. 2 is a fragmentary side elevation thereof, and

racemes Fen-raters.

Fig. 3 shows a planview of 'a form of screening thimble employed.

' Referrm now more particularly to the drawings w erein'like numerals of reference designate similar parts in each of the fi ures,

the numerals 1 and 2 refer, respective to outer and inner pipe sections concentrically arranged and spaced apart, the pipes being of such a relative diameter as to provide a space 3 between them, usually about one half inch across. These pipes are held in fixed relation by means of the collars 4 and 5 secured upon the inner pipe in any practical manner and to which the outer pipes are also fixed, said collars being spaced a short distance from the corresponding ends of, the pipes, and the ends of said pipes which project beyond the respective collars being externally threaded to receive the internally threaded couplings 6 and 7 which are secured thereon and which receive an abutting end of the adjacent section. The ends of the inner couplings abut against the inafter explained. Both outer and inner pipes are perforated, the perforations 8 of the inner pipe being considerably larger in diameter than the perforations 9 of the outer pipe. The inner ,pipe is wrapped with spirally wound wire 10 of any desirable cross sectional contour, the turns of wire being spaced a distance apart so as to form a narrow spiraled slit between the turns of wire through which the fluid passes to the perforations and thence to the interior of the inner pipe. For the purpose of illustration, the inner pipe shown in Fig. l is shown as having also slitted thimbles 11 secured in the perforations, said thimbles talring the place of the s irally wound screening wire, the slits t ereof admitting the fluid but excluding the sand. In use, either the spirally wound wire or the thimbles or any other suitable screening surface may be employed.

' The space between pipes is filled with a coarse aggregate as gravel, cinder or the like. As above explained, the perforations of the outer pipe are of small diameter so as to exclude the larger particles of detritus and said outer pipe is not wrapped or provided with a screening surface, as spirally wound wire or slitted thimbles. The inflowing fluid passes through the perforations 9 of the outer pipe and the sand and detritus held in suspension therein is arrested by the coarse screen comparatively free of detritus andpasses through said screento. the interior of the inner pipe and passes through said inner screen up to the surface.

' a What I claim is:

1.A well screen consisting of an outer and an inner pipe spaced apart, detachable collars inter osed between said pipes near their respectlve ends to secure them in fixed relation to each other, the ends of said pipes being threaded couplings threaded on said ends, the ends of the inner couplings abutting against the adjacent collars to .hold them securely in lace, the outer pipe being provided with smal perforations and the inner pipe being provided with larger perforations, a

2., A well screen consisting of an outer I and an inner pipe, detachable collars interposed between said pipes near their respective ends tosecure them fixed in spaced relation to each other, each of saidpipes being provided with perforations, a screening surface protecting the perforations of the .inner pipe, coarseaggrelgate filling the space between said pipes and eing retained therein by said collars, and means holding said collars in place against said aggregate.

.In testimony whereof Ihave signed my name to this specification in the presence of two subscribing witnesses.

HENRY RODRIGO, SR.

Witnesses: L

FLORENCE JOHNSTON E. V. HARDWAY. 

